feat(forge): pluggable forge abstraction + GitLab and Gitea/Forgejo/Codeberg (#1913)

* refactor(forge): forge-neutral foundation (GitHub-only)

Decouple git-hosting from GitHub behind a neutral abstraction (issue #1616), GitHub-only for now; existing GitHub behaviour is unchanged.

- Forge manifest, neutral ForgeService contract, forge registry + resolver, and a client forge-module registry.
- GitHub code renamed to the neutral shape; PR/Issue attachment wording preserved.
- forge.search.response enums parse tolerantly (unknown kind/auth state degrade instead of breaking the client).
- createPullRequest reports typed CLI/auth errors instead of a generic message.
- forge-resolver host/remote caches are LRU-bounded.
- Forge host trust is explicit: only a known cloud host or a CLI-authenticated host is ever talked to; an unauthenticated GitHub Enterprise host fails resolution instead of routing to github.com.
- Docs: forge-providers guide, glossary and i18n forge-copy conventions, architecture and rpc-namespacing terminology.
- Vitest React Native mocks (unistyles, svg, linking, lucide) consolidated into shared aliased test-stubs.

* feat(forge): GitLab adapter, forge-aware UI, pipelines and approvals

GitLab adapter over the glab CLI on the neutral contracts: MR status, forge-aware UI, pipeline tree, and N-of-M approvals.

- threadIsResolved is part of the neutral timeline item.
- Pipeline load failures show an error instead of an empty section.
- Manual pipeline jobs render as pending.
- Fork/detached MR head pipelines are fetched by MR iid (glab ci get --merge-request).

* feat(forge): Gitea family adapter (Gitea, Forgejo, Codeberg)

One adapter over the tea CLI serving Gitea, Forgejo, and Codeberg on the neutral contracts.

- CI status aggregates commit statuses and Actions runs together.
- Gitea's terminal "warning" state maps to failure on server and client.
- Gitea Actions check details are reachable from the PR pane by workflowRunId.

* refactor(forge): localize compatibility handling

* test(forge): expect normalized GitLab facts

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

docs/glossary.md

@@ -13,9 +13,12 @@ Authoritative terminology. UI label wins. Don't invent synonyms; use what's here
 - **Project host entry** — One row in a project for a single (project, daemon) pair, aggregating that daemon's workspaces in the project. Internal. Code: `ProjectHostEntry` (`packages/app/src/utils/projects.ts:11`). Don't introduce "Checkout" as a synonym.
 - **Placement** — One workspace's relationship to its project (projectKey, projectName, git checkout snapshot). Internal. Code: `ProjectPlacementPayload` (`packages/protocol/src/messages.ts:2113`).
 - **Branch** — Plain git branch. UI: "Switch branch". Code: `currentBranch` in `WorkspaceGitRuntimePayloadSchema` (`packages/protocol/src/messages.ts:2136`); `BranchSwitcher` (`packages/app/src/components/branch-switcher.tsx`).
+- **Forge** — Git hosting service behind Paseo's change-request features: GitHub, GitLab, Gitea, Forgejo, or a future registered adapter. Code: `ForgeService`, `forge-registry`, `forge-resolver`. Use `forge` for internal abstraction and registry IDs; use concrete forge names only when a behavior or RPC is forge-specific.
+- **Change request** — Forge-neutral term for a proposed branch-to-branch code change. UI normally renders the forge noun instead: GitHub/Gitea/Forgejo "PR", GitLab "MR". Code: `forge_change_request` attachments, `checkoutSource: { kind: "change_request" }`, and PR/MR status payloads.
+- **MR** — GitLab merge request. UI label for GitLab change requests only; do not use MR for GitHub/Gitea/Forgejo.
 - **Worktree** — Paseo-managed git worktree (`~/.paseo/worktrees/{name}`); also a `workspaceKind` value. UI: CLI + `paseo.json` keys (`worktree.setup`, `worktree.teardown`) only. Code: `ProjectCheckoutLiteGitPaseoPayload` (`packages/protocol/src/messages.ts:2092`); CLI `paseo worktree` (`packages/cli/src/commands/worktree/index.ts:8`). Forbidden: "Checkout" as a synonym.
 - **Repository / Remote** — Internal git inputs (`remoteUrl`, `mainRepoRoot`) used to derive `projectKey`. No UI label.
-- **Directory-backed surface** — A right-sidebar surface whose content is determined by the workspace's `cwd`, so two workspaces on the same directory see identical content: git diff/status, GitHub PR info, file preview/explorer contents. Keyed by `(serverId, cwd)`, never `workspaceId`. See [architecture.md](architecture.md#right-sidebar-boundary-directory-backed-vs-workspace-owned).
+- **Directory-backed surface** — A right-sidebar surface whose content is determined by the workspace's `cwd`, so two workspaces on the same directory see identical content: git diff/status, forge change-request info, file preview/explorer contents. Keyed by `(serverId, cwd)`, never `workspaceId`. See [architecture.md](architecture.md#right-sidebar-boundary-directory-backed-vs-workspace-owned).
 - **Workspace-owned state** — Per-workspace state that never leaks to a same-`cwd` sibling: tabs, agents, terminals, panes, title, plus review drafts, diff-mode overrides, composer attachments, and file-explorer open/expand state. Keyed by `workspaceId` (`cwd` only as a fallback for old payloads). See [architecture.md](architecture.md#right-sidebar-boundary-directory-backed-vs-workspace-owned).
 - **Workspace status bucket** — Aggregate activity signal for a workspace row. Same-`cwd` workspaces intentionally share agent and terminal status buckets, while tab, agent, and terminal visibility remains scoped by `workspaceId`.
 - **Agent session** — One running instance of an agent inside a workspace (one provider, one model, one cwd, one timeline). The conceptual unit; in the UI this opens as a tab. Moving toward this as the canonical term over "Agent". Code: `AgentSnapshotPayload` (`packages/protocol/src/messages.ts:608`).
@@ -28,7 +31,7 @@ Authoritative terminology. UI label wins. Don't invent synonyms; use what's here
 - **Schedule** — Cron-style trigger that creates new agents. UI: CLI/MCP (`paseo schedule`, `create_schedule`). Don't confuse with: Heartbeat (cron prompt back into the same agent) or Loop (iterative re-execution of one agent).
 - **Heartbeat** — Cron-style prompt sent back into the same agent/conversation. MCP: `create_heartbeat`. Use for reminders and babysitting where the status should return inline.
 - **Mode** — Provider-specific operational mode (plan, default, full-access, …). UI: icon-only. Code: `modeId` in `AgentSessionConfig` (`packages/protocol/src/messages.ts:257`).
-- **Attachment** — GitHub PR or Issue bound to an agent prompt. UI: "Attach issue or PR". Code: `AgentAttachment` (`packages/protocol/src/messages.ts:782`).
+- **Attachment** — External or local context bound to an agent prompt: forge issue/change request, review context, uploaded file, text, or image. UI: "Attach issue or PR/MR". Code: `AgentAttachment` (`packages/protocol/src/messages.ts:782`).
 - **Composer** — The whole prompt surface for sending work to an agent. Code: `Composer` (`packages/app/src/composer/index.tsx`). Don't call this "message input" except for the text-entry subcomponent.
 - **Composer input** — The text-entry surface inside the composer. Code: `MessageInput` (`packages/app/src/composer/input/input.tsx`).
 - **Composer toolbar** — The bottom control row inside the composer input. Contains agent controls, attachment button, voice controls, and stop/send controls. Code: `leftContent`, `beforeVoiceContent`, and `rightContent` slots in `MessageInput` (`packages/app/src/composer/input/input.tsx`). Forbidden: "Status bar".